See below. I don't think there's a problem with mentioning your blog at relevant times but it is probably not a good idea to be a member on DU solely for the purpose of generating traffic to your site.
At Wed Jun 5, 2013, 12:15 PM an alert was sent on the following post:
thanks
http://www.democraticunderground.com/?com=view_post&forum=1158&pid=2078
REASON FOR ALERT:
This post is disruptive, hurtful, rude, insensitive, over-the-top, or otherwise inappropriate. (See <a href="http://www.democraticunderground.com/?com=aboutus#communitystandards" target="_blank">Community Standards</a>.)
ALERTER'S COMMENTS:
Seems like a nice guy, but he's spamming his own site. See profile- http://www.democraticunderground.com/?com=profile&uid=304774 -- " I run the site www.godownsize.com. A site about simple living and downsizing "
From the TOS (http://www.democraticunderground.com/?com=termsofservice)- No spammers.
Do not spam Democratic Underground with commercial advertising or promotions.
You served on a randomly-selected Jury of DU members which reviewed this post. The review was completed at Wed Jun 5, 2013, 12:19 PM, and the Jury voted 3-3 to LEAVE IT.
Juror #1 voted to LEAVE IT ALONE and said: OK, so he's plugging his blog. But several other DUers, even prominent ones, do the same thing. It's not like he's trying to sell stuff. The "anti-spam" rule is IMO more to target those "my sister makes $3000 per week posting links on the Internet" types of post.
Juror #2 voted to LEAVE IT ALONE and said: No explanation given
Juror #3 voted to LEAVE IT ALONE and said: Not sure if he is a spammer or not. Leave it
Juror #4 voted to HIDE IT and said: No explanation given
Juror #5 voted to HIDE IT and said: agree, this is spam, all his posts are simply links to his site
Juror #6 voted to HIDE IT and said: yep, looks commercial.
Thank you very much for participating in our Jury system, and we hope you will be able to participate again in the future.